Think of the potential of this vessel to support amphibious operations or the MLP. The Thialf has two cranes with a combined maximum lifting capacity of metric tons, making it the largest crane vessel in the world.

Not a submarine. Littoral Combat Ship - a class of relatively small surface vessels intended for operations in the littoral zone (close to shore) by the United States Navy. Likened to corvettes of other navies. -- The Industrialist

MV Blue Marlin is a semi-submersible heavy lift ship designed to transport very large semi-submersible drilling rigs above the transport ship's deck. It is equipped with 38 cabins to accommodate 60 people, a workout room, sauna and swimming facilities.